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    On equilibrium in non-hydrostatic metamorphic systems

    265221.pdf (636.9Kb)
    Access Status
    Open access
    Authors
    Powell, R.
    Evans, Katy
    Green, E.
    White, R.
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Powell, R. and Evans, K. and Green, E. and White, R. 2018. On equilibrium in non-hydrostatic metamorphic systems. Journal of Metamorphic Geology. 36 (4): pp. 419-438.
    Source Title
    Journal of Metamorphic Geology
    DOI
    10.1111/jmg.12298
    ISSN
    0263-4929
    School
    School of Earth and Planetary Sciences (EPS)
    Remarks

    This is the peer reviewed version of the following article: Powell, R. and Evans, K. and Green, E. and White, R. 2018. On equilibrium in non-hydrostatic metamorphic systems. Journal of Metamorphic Geology. 36 (4): pp. 419-438, which has been published in final form at 10.1111/jmg.12298. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving at http://olabout.wiley.com/WileyCDA/Section/id-828039.html

    URI
    http://hdl.handle.net/20.500.11937/67523
    Collection
    • Curtin Research Publications
    Abstract

    Metamorphic geology has accumulated a huge body of observation on mineral assemblages that reveal strong patterns in occurrence, summarized, for example, in the idea of metamorphic facies. On the realization that such patterns needed a simple explanation, there has been considerable a posteriori success from adopting the idea that equilibrium thermodynamics can be used on mineral assemblages to make sense of the patterns in terms of, for example, the pressure and temperature of formation of mineral assemblages. In doing so, a particularly simple implicit assumption is made, that mineral assemblages operate essentially hydrostatically. Structural geologists have studied the same rocks for different ends, but, remarkably, the phenomena they are interested in depend on non-hydrostatic stress. We look at the effect of such behaviour on mineral equilibria. With adoption of some plausible assumptions about how metamorphism in the crust works, the consequence of minerals being non-hydrostatically stressed is commonly second order in equilibrium calculations.

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